10-08-2018, 03:07 PM
Hi,
Charles's chart did come from me, it was on the Speedex site at one time. As warned then there do seem to be a few sets of figures around for the standard profile and all the figures, with unknown provenance, are quoted with potential measuring, setting up, wear and accuracy errors. I suspect, and I've no evidence to support this, that the profiles are probably a simple and symmetric as the Bruce White dimensions suggest and then the check on set up accuracy is that the maximum inlet lift ATDC figure should be the same as the phase angle - probably at or near 110 degrees ATDC. Different figures for the sports cams may be just other discrepancies rather than a different profile.
A CAD package should be able to predict the specs of the standard profiles from Bruce White's geometry if that's what you're after.
Hope of interest, Dave.
Charles's chart did come from me, it was on the Speedex site at one time. As warned then there do seem to be a few sets of figures around for the standard profile and all the figures, with unknown provenance, are quoted with potential measuring, setting up, wear and accuracy errors. I suspect, and I've no evidence to support this, that the profiles are probably a simple and symmetric as the Bruce White dimensions suggest and then the check on set up accuracy is that the maximum inlet lift ATDC figure should be the same as the phase angle - probably at or near 110 degrees ATDC. Different figures for the sports cams may be just other discrepancies rather than a different profile.
A CAD package should be able to predict the specs of the standard profiles from Bruce White's geometry if that's what you're after.
Hope of interest, Dave.